A stalled out frontal boundary zone will keep it somewhat unsettled around here today and give us a chance at scattered showers, maybe even a thunderstorm. This same front will sag to the south on Saturday as high pressure builds to our north and the weather tomorrow is likely to turn out to be quite decent. Low pressure will ride up along that same frontal boundary zone from tomorrow night into Sunday and that could bring a return of some shower and thunderstorm activity to the region. Temperatures over the next few days will be rather comfortable for this time of year as high pressure builds into southeastern Canada and produces low-level northeasterly flow.
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The overall weather pattern will remain very unsettled in parts of the Mid-Atlantic region right though the upcoming weekend with the threat for more torrential downpours and localized flash flooding; especially, south of the PA/MD border. The combination of an extremely humid air mass, a stalled out frontal boundary zone, and multiple low pressure systems should provide enough “lift” in the atmosphere to continue to produce heavy rainfall with rain rates of 2+ inches per hour. Given the already very well-saturated grounds, this additional rainfall can lead to some serious localized flash flooding conditions. With limited wind flow in the lower atmosphere, any shower or thunderstorm that develops in this pattern will be slow-moving and potentially resulting in a few inches of rain over a relatively short period of time.
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The overall weather pattern will remain unsettled around here over the next couple of days with the continuing threat for showers and thunderstorms. Some of the rain can be heavy at times; especially, on the southwest side of the immediate metro region. A slow-moving frontal system will keep it unsettled around here, but this same frontal system should move to our south this weekend as strong high pressure builds across southeastern Canada. As a result, the chance for rain should diminish this weekend and temperatures will be pretty comfortable for this time of year.
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The overall weather pattern will remain quite unsettled in the Mid-Atlantic region over the next several days with the threat for more torrential downpours with rates of 2+ inches per hour and flash flooding conditions. The combination of an extremely humid air mass, a stalled out frontal boundary zone, and multiple low pressure systems should be able to provide enough “lift” in the atmosphere to result in heavy rainfall in coming days and given the already well-saturated grounds, this can lead to some serious flash flooding. In fact, there were torrential downpours in the pre-dawn hours across northern Virginia that resulted in damage to roadways in places like Manassas Park and the entire DC-to-Philly-to-NYC corridor remains under “flash flood watches” as a result of the potential for more heavy rainfall and saturated grounds.
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An unsettled second half of the week begins today in the NYC metro region and lasts right through the upcoming weekend. A weak frontal system will stall out nearby later today and several areas of low pressure will ride along the boundary zone in coming days. As a result, there will be a good chance of showers and possible PM thunderstorms on a daily basis into the weekend and any rain can be heavy at times given the high available amounts of moisture in the atmosphere. Flash flooding is a concern given the potential of some heavy rainfall and the already well-saturated grounds from recent soaking rains. In addition to the increased chances for rain, this unsettled weather pattern will bring about a cool down as we progress through the week with cooler-than-normal highs in the lower 80’s by week’s end and likely continuing this weekend as well.
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An unsettled second half of the week is coming to the Mid-Atlantic region as a weak frontal system will stall out in nearby proximity. In addition to the stalled out frontal boundary zone, there will be several areas of low pressure that develop and track along this front right into the upcoming weekend. As a result, the chance of showers and thunderstorms will be quite high on a daily basis from tomorrow into the weekend and temperatures will trend downward as the week progresses.
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It looks like another 24 hours or so of unsettled weather conditions for the Mid-Atlantic region due to the combination of upper-level energy, a meandering frontal system, and strong winds in the upper part of the atmosphere. There can be additional showers and thunderstorms today and tonight with the chance for some heavy rainfall at times and, given the already well-saturated grounds, this could lead to flash flooding in some spots. High pressure will build into the area this weekend and there will be improving weather conditions although a couple of showers cannot be ruled out for Saturday, maybe a thunderstorm. Elsewhere, the Atlantic Basin tropical scene looks rather quiet and should stay so for the next several days. One final note, the annual Perseid meteor shower will peak next week…best to look for meteors in the pre-dawn hours of Tuesday, Wednesday and Thursday.
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The weather looks quite unsettled for the New York City metro region from later today through tomorrow night as a frontal system will meander nearby leading to the chance of aditional showers and thunderstorms. Flash flooding may indeed become a renewed concern given the already well-saturated grounds and the expected new rainfall which can be heavy at times from later tonight through tomorrow night. Looking ahead, the weekend is shaping up to be pretty decent for this time of year with a chance for a shower or thunderstorm on Saturday and then likely rain-free conditions on Sunday. Temperatures will turn cooler today and remain rather moderate over the next few days. As far as the tropics are concerned, it looks quiet on that scene with a lull in the action for the Atlantic Basin during the next several days.
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A quiet day is coming to the Mid-Atlantic region following the wild weather of Tuesday that was associated with Tropical Storm “Isaias”. “Isaias” has raced into the southeastern part of Canada and high pressure will build into the region and generally take control of the weather for the next few days. There can be a few scattered showers and thunderstorms later in the week as a weak front meanders in the region, but much of the time over the next few days should be rain-free. As far as the tropics are concerned, it looks quieter on that scene as well with a lull in the action for the Atlantic Basin which has had a very active season so far.
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The good news is that “Isaias” is accelerating to the northeast and the wild weather should wind down later this afternoon in much of the Mid-Atlantic region. In fact, the sun could actually return in portions of the Mid-Atlantic region later today. The bad news is that there is another several hours to get through before we get to that point with some pretty rough weather including more flooding rainfall, powerful and potentially damaging wind gusts, numerous power outages and isolated tornadoes. By later tonight, “Isaias” will race across interior New England on its way to southeastern Canada and the weather in the Mid-Atlantic region will improve markedly overnight and on Wednesday.
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